Model burglar-alarm.



No. 7|3,965. Patented Nov. I8, i902.

E. F. CUNKLlN.

MODEL BURGLAR ALARM.

(Application file d Sept. 20, 1901.) (No Model.)

. BY WM )YM A TTOHNEYS mt onine mens co momuwa.. I Asumaon, D c.

UNITED STATES PATENT OEETCE.

EMMET FRANK CONKLIN, OF CHICAGO, ILLINOIS.

MODEL BURG LAR-ALARM.

SPECIFICATION forming part of Letters 'Patent No. 713,965, datedNovember 18, 1902.

p Application filed September 20, 1901. Serial No. 75,664. (No model.)

To all whom, t pta/y concern,.-

Be it known that I, EMMET FRANK CONKLIN, a citizen of the United States,and a resident of Chicago, in the county of Cook and State of Illinois,have invented anew and Improved Model Burglar-Alarm, of which thefollowing is a full, clear, and exact description.

My invention relates to burglaralarms,and more particularly to a simple,efficient, and

cheap device to be automatically operated by the opening of a door.

Reference is to be had to the accompanying drawings, forming a part ofthis specication, in which similar characters of reference shape, and atthe other end with a movable plate 23, mounted upon a lug 21, carryingthe` firing-pin 22, said plate 23 being provided with a pivot 24 andfree to swing in a semicircle, as shown in Fig. 1. Upon the outer end ofthe plate 23 are a pair of-hooks 25 integral therewith to be driven intothe door for the purpose of securing said plate in place. The object inhaving the plate 23 movable upon the plate 4 is t-o facilitate theremoval of the plate 4 from the door-facing. A pair of' rivets 6 connecta stationary plate 7 with the plate 4, said rivets passing through astationary bridge-plate 8. The bridge-plate 8 is quite narrow and isstraddled by a slot 9 in a plate 9. By this means the plate 9 is free tomove slightly to the right or to the left.

Upon the plate 9 and integral therewith is a head 13, provided with adog 14, which parts move slightly with said plate 9. A spring 10 engagesa hook 10 upon said slide and normally presses the slide to the leftinto the position shown in Fig. 2. The plate is provided with ears 1112, in which is mounted a rocking shaft 15, surrounded by a spring 16,which passes over the hammer 17 and is secured to the ears, as shown inFig. 3. The hammer 17 is provided with a head 20, which has acartridge-chamber 18 for the purpose of holding a blank cartridge 19.The hammer 17 is free to swing in the arc of a circle, as shown in Fig.2, and is provided with a notch 26 for securing the hammer when thelatter is retracted into the position shown in Fig. 1. The dog 14engages the notch 26 when the head 13 is pushed inward by the pressureof the jamb upon the door, as shown in Fig. 1. open, as indicated inFig. 2, the slide 9 moves outward to the left under pressure of thespring 10, and thereby pulls the dog 14 from the notch -26 in thehammer, thus causing the hammer to describe a semicrcle and strike thestationary ring-pin 22, as indicated in Fig. 2. The position of thecartridge-chamber is such that when the explosion occurs the flames andpowder-gases are projected outwardly from the door, thus avoiding thepossibility of leaving powder-marks upon the door or of setting re tothe same.

The operation of my device is as follows: The device being in theposition shown in Fig. 2, the hammer is pulled slightly asunder from thefiring-pin, a cartridge is inserted in the cartridge chamber, the hammeris moved around in the semicircle indicated by the dotted line, thenotch 26 is brought into proximity with the dog 14 and held in thisposition while the door is closed. The closing of the door causes thejamb 2 to move the head 13, and consequently the slide 9, slightlyinward, thus causing the dog 14 to engage the notch 26. The door being`now closed, the apparatus is ready for use. If any person afterwardopens the door, the head 13, carrying the dog 14, will be moved to theleft, as above described, the hammer carrying the cartridge will bedisengaged and will cause the cartridge to strike the firing-pin, thusoccasioning an explosion of the cartridge, and thereby giving warning ofthe opening of the door. The head 13 therefore acts as a trigger fordisengaging the hammer, its action being a good deal like the action ofthe trigger of a gun.

It will be observed, therefore, that my device is not only simple andeasily constructed, but is not liable to get out of order and is easilyremoved from one door to another,

When, however, the door is Y IOO nected with said plate and free to moverelal5 tively to said firing-pin and in the are of a circle, said hammerbeing provided with a notch, and a trigger for engaging said notch andtemporarily holding said hammer, said trigger being free to release saidhammer 2o When actuated by the movements of said door. In testimonywhereof I have signed my name to this speeication in the presence of twosubscribing Witnesses.

EMMET FRANK CON KLIN. Witnesses:

WM. J. MEYERs, MARY J. LEONARD.

